<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        h2 {
            font-weight: bold;
            border: 5px dashed green;
        }
    </style>
</head>
<body>
<h2>这是一段文字</h2>
<em>这是斜体</em>
<span>这是span</span>
<div>这是div</div>
</body>
</html>